ok i have a 97 Blazer 4X4 4.3L. with a P1870. I've heard that i need to replace the valve body, so i pulled it off today and looked at it. i was also told to look at the plate to make sure that one of the balls aren't stuck, and they weren't. The plate has a bit of wear on one hole but nothing to bad. The valve body.....well what can i say. I don't know what i'm looking for but the its made of aluminum and i don't see nothing wrong with it. Can someone PLEASE tell me what i'm looking for. thanks

ok hear is some more for everyone to think of. is it possible i dont need a valve body but just a TCC, and to add on to that, the hole TCC (wire harness) or just the part of the TCC inside the valve body.

ok hear we go again, is the TCC shaft that is in the valve body, is that supose to come out, cause i tried with LIGHT pressure, but it wouldn't move can some one please help

just replace the valve body i had the same codes and i replaced the valve body and all was well.

I had the Sonnax TCC kit installed on my 1997 Blazer. there's some drilling on the valve body involved that has to be right, so I had a shop do it. I think it was about $220 total, and it got me by for about 4 years before the transmission died at 140,000 miles.

I don't know what a new valve body costs now compared to the TCC kit.